Interest and difficulties of studying ground water tables in urban area

Example of the alluvial ground water table in Paris

Abstract

A lot of examples show how necessary it is to know and, if possible, to forecast the evolution of the ground water table in big urban centers. This is why, in 1978, the city of Paris realized a permanent surveying network of the alluvial ground water table. Since then, monthly observations are made on the piezometric evolution as well as the chemical one. From the analysis of the results collected during two years, general conclusions can be already about the working of such a network. Furthermore, the conditions for a good knowledge of the ground water table in a urban environment can be given.